Overview
The LM4889MM is a 1W audio power amplifier manufactured by National Semiconductor, designed primarily for portable communication devices such as mobile phones. This compact and efficient amplifier is well-suited for low-voltage applications, offering high-quality audio output with minimal external components. Its market positioning targets portable electronics, emphasizing its low power consumption and space-saving design. The LM4889MM stands out for its ability to deliver clear audio performance without requiring output coupling capacitors or bootstrap capacitors, making it ideal for modern, compact devices.
Key Specifications
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| Output Power | 1 | W | Continuous average power to an 8Ω BTL load |
| THD + Noise | 0.1 | % | At 1 kHz |
| Power Supply Voltage | 2.2 - 5.5 | V | Operating range |
| Load Impedance | 8 | Ω | Minimum load |
| Operating Temperature | -40 to +85 | °C | Range |
| Shutdown Current | 0.01 | µA | Low-power consumption mode |
| PSRR | 66 | dB | Power Supply Rejection Ratio |
| SNR | 93 | dB | Signal-to-Noise Ratio |
| Package | VSSOP-8 | - | Space-saving design |
Key Features
- High-quality audio output with minimal distortion (THD+N < 0.1%).
- Low power consumption with a shutdown mode current of 0.01µA.
- No need for output coupling capacitors or bootstrap capacitors, reducing external component count.
- Improved pop & click circuitry eliminates noise during turn-on and turn-off transitions.
- Unity-gain stable, configurable with external gain-setting resistors.
- Internal thermal shutdown protection ensures safe operation.
Applications
The LM4889MM is widely used in portable communication devices, particularly mobile phones, due to its compact size and low power consumption. It is also suitable for other low-voltage applications such as portable media players, handheld gaming devices, and small audio systems. Its ability to deliver high-quality audio with minimal external components makes it a preferred choice for modern, space-constrained electronic designs.
Q & A
1. What is the output power of the LM4889MM?
The LM4889MM delivers 1W of continuous average power to an 8Ω BTL load.
2. What is the operating voltage range of the LM4889MM?
The operating voltage range is 2.2V to 5.5V.
3. Does the LM4889MM require output coupling capacitors?
No, the LM4889MM does not require output coupling capacitors or bootstrap capacitors.
4. What is the shutdown current of the LM4889MM?
The shutdown current is 0.01µA, ensuring minimal power consumption in standby mode.
5. What is the THD + Noise of the LM4889MM?
The THD + Noise is 0.1% at 1 kHz.
6. What is the operating temperature range of the LM4889MM?
The operating temperature range is -40°C to +85°C.
7. What is the load impedance supported by the LM4889MM?
The minimum load impedance supported is 8Ω.
8. Does the LM4889MM have thermal protection?
Yes, it features internal thermal shutdown protection.
9. What is the PSRR of the LM4889MM?
The Power Supply Rejection Ratio (PSRR) is 66dB.
10. What package does the LM4889MM come in?
The LM4889MM is available in a VSSOP-8 package, which is compact and space-saving.
